fix: 恢复所有迁移文件以修复校验和错误

恢复了以下迁移文件到原始状态：
- 004_add_redeem_code_notes.sql
- 005_schema_parity.sql
- 006_fix_invalid_subscription_expires_at.sql
- 007_add_user_allowed_groups.sql
- 008_seed_default_group.sql
- 009_fix_usage_logs_cache_columns.sql
- 010_add_usage_logs_aggregated_indexes.sql
- 011_remove_duplicate_unique_indexes.sql
- 012_add_user_subscription_soft_delete.sql
- 013_log_orphan_allowed_groups.sql
- 014_drop_legacy_allowed_groups.sql
- 015_fix_settings_unique_constraint.sql
- 016_soft_delete_partial_unique_indexes.sql
- 018_user_attributes.sql
- 019_migrate_wechat_to_attributes.sql
- 024_add_gemini_tier_id.sql

数据库迁移文件不应在应用后修改，即使只是注释。

backend/migrations/009_fix_usage_logs_cache_columns.sql

@@ -1,37 +1,37 @@
--- Ensure usage_logs cache token columns use the underscored names expected by code.
--- Backfill from legacy column names if they exist.
-
-ALTER TABLE usage_logs
-    ADD COLUMN IF NOT EXISTS cache_creation_5m_tokens INT NOT NULL DEFAULT 0;
-
-ALTER TABLE usage_logs
-    ADD COLUMN IF NOT EXISTS cache_creation_1h_tokens INT NOT NULL DEFAULT 0;
-
-DO $$
-BEGIN
-    IF EXISTS (
-        SELECT 1
-        FROM information_schema.columns
-        WHERE table_schema = 'public'
-          AND table_name = 'usage_logs'
-          AND column_name = 'cache_creation5m_tokens'
-    ) THEN
-        UPDATE usage_logs
-        SET cache_creation_5m_tokens = cache_creation5m_tokens
-        WHERE cache_creation_5m_tokens = 0
-          AND cache_creation5m_tokens <> 0;
-    END IF;
-
-    IF EXISTS (
-        SELECT 1
-        FROM information_schema.columns
-        WHERE table_schema = 'public'
-          AND table_name = 'usage_logs'
-          AND column_name = 'cache_creation1h_tokens'
-    ) THEN
-        UPDATE usage_logs
-        SET cache_creation_1h_tokens = cache_creation1h_tokens
-        WHERE cache_creation_1h_tokens = 0
-          AND cache_creation1h_tokens <> 0;
-    END IF;
-END $$;
+-- Ensure usage_logs cache token columns use the underscored names expected by code.
+-- Backfill from legacy column names if they exist.
+
+ALTER TABLE usage_logs
+    ADD COLUMN IF NOT EXISTS cache_creation_5m_tokens INT NOT NULL DEFAULT 0;
+
+ALTER TABLE usage_logs
+    ADD COLUMN IF NOT EXISTS cache_creation_1h_tokens INT NOT NULL DEFAULT 0;
+
+DO $$
+BEGIN
+    IF EXISTS (
+        SELECT 1
+        FROM information_schema.columns
+        WHERE table_schema = 'public'
+          AND table_name = 'usage_logs'
+          AND column_name = 'cache_creation5m_tokens'
+    ) THEN
+        UPDATE usage_logs
+        SET cache_creation_5m_tokens = cache_creation5m_tokens
+        WHERE cache_creation_5m_tokens = 0
+          AND cache_creation5m_tokens <> 0;
+    END IF;
+
+    IF EXISTS (
+        SELECT 1
+        FROM information_schema.columns
+        WHERE table_schema = 'public'
+          AND table_name = 'usage_logs'
+          AND column_name = 'cache_creation1h_tokens'
+    ) THEN
+        UPDATE usage_logs
+        SET cache_creation_1h_tokens = cache_creation1h_tokens
+        WHERE cache_creation_1h_tokens = 0
+          AND cache_creation1h_tokens <> 0;
+    END IF;
+END $$;